package com.atguigu.springboot.component;

import jdk.jfr.ContentType;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 登录检查
 */
public class LoginHandlerInterceptor implements HandlerInterceptor
{
    //目标方法执行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
     Object user= request.getSession().getAttribute("loginUser");
   if(user==null){
       //未登录，返回登录页面
       request.setAttribute("msg","没有登录权限");
       RequestDispatcher dispatcher = request.getRequestDispatcher("/index.html");

     dispatcher.forward(request,response);
       return  false;

   }else {
       //已经登录.放行请求
       return  true;
   }

    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}
